Replace the generic Step function with Given/When/Then functions to match the majority of other languages

[mirogta]

🤔 What's the problem you're trying to solve?

I'm trying to add support for Go (godog) to Cucumber language service, so that we can finally use Go BDD support in VSCode.

It's a bit tricky because of the generic Step func and not having the separate Given/When/Then funcs instead.

Raised a poll here: https://github.com/cucumber/godog/discussions/542

✨ What's your proposed solution?

• Mark the Step function as deprecated
• Add 3 new functions to match their respective counterparts in the feature files - Given/When/Then

⛏ Have you considered any alternatives or workarounds?

No alternatives considered. I think we should "just" do this to keep the syntax consistent with other programming languages.

📚 Any additional context?

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